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tkhunny
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tkhunny
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Join Date
04-12-2005
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Today
07:19 PM
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Today,
05:14 PM
tkhunny
replied to a thread
Method of solving
in
Intermediate/Advanced Algebra
Failing to do it is called "error". It is not a valid step in any list I ever have encountered. It is a device to remember that equivalence must...
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2 replies | 24 view(s)
Today,
05:11 PM
tkhunny
replied to a thread
Get distance from XY position unto the nearest point of a square
in
Geometry and Trig
Can it be inside? I would extend all four sides of the square, defining 8 external regions. this gives only three things to do, depending on...
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3 replies | 35 view(s)
Yesterday,
10:21 PM
tkhunny
replied to a thread
Question about circumference
in
Geometry and Trig
I stand by #3. "Circumference" can be either the distance around something, not necessarily a circle, or the enclosing boundary itself.
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5 replies | 61 view(s)
Yesterday,
08:38 PM
tkhunny
replied to a thread
Question about circumference
in
Geometry and Trig
1) line SEGMENT 2) Definition. A circumference must enclose something. 3) Sometimes, the circumference may refer to the linear distance only, and...
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5 replies | 61 view(s)
Yesterday,
05:25 PM
tkhunny
replied to a thread
Area of a sector of a circle (shaded portion)
in
Calculus
If only there were a way to know what the machine wants. Maybe add units? Maybe two decimal places?
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6 replies | 71 view(s)
Yesterday,
04:36 PM
tkhunny
replied to a thread
Area of triangle with angle of 5*pi/6
in
Geometry and Trig
Come now, Elissa. Math doesn't hate you. :-) In this case, you have reasoned it out nicely. You need just one more clue from the problem...
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3 replies | 53 view(s)
Yesterday,
10:40 AM
tkhunny
replied to a thread
Approximating probability P (X<0.56) for n=10 using central limit theorem
in
Probability / Statistics
Rather than argue with the hint, why not think about what the Central Limit Theorem does an give the question more thought? The Central Limit...
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2 replies | 65 view(s)
09-16-2018,
01:49 AM
tkhunny
replied to a thread
Matrix equations: How to solve this matrix equation by X. CXB+AX=C
in
Intermediate/Advanced Algebra
Have you tried left C^{-1}? Why do you believe it can be done?
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9 replies | 162 view(s)
09-14-2018,
01:36 PM
tkhunny
replied to a thread
Correct geometric name for this two-dimensional figure
in
Geometry and Trig
It is possible that some author with some specific purpose will name whatever shape the author needs to invent. This is most likely a matter of...
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7 replies | 145 view(s)
09-13-2018,
03:26 PM
tkhunny
replied to a thread
Correct geometric name for this two-dimensional figure
in
Geometry and Trig
Why must it have a name? Call it "Steve", if you like. It is somewhat reminiscent of a "Luna" from Projective Geometry, but not a real close...
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7 replies | 145 view(s)
09-13-2018,
03:19 PM
tkhunny
replied to a thread
Differentiation with constants: U(t) = A(1 - e^{-Bt^2}) + c; A,B,c > 0
in
Calculus
What have you tried? How do you think it works? Is there a difference between ADDED constants and MULTIPLIED constants? For any constant, c,...
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3 replies | 108 view(s)
09-11-2018,
09:12 PM
tkhunny
replied to a thread
Urgent help for desperate child: Using four 6s and + , - , divide, x2 , ( ),...
in
Arithmetic
Frankly, if those are possibly, you already proved your mettle with the solutions to 10 and 18. Keep trying!
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12 replies | 306 view(s)
09-11-2018,
09:09 PM
tkhunny
replied to a thread
Pool Design Question: You have 88m of fence available...
in
Geometry and Trig
Lovely problem statements. Let's see your best efforts, shall we? Draw two pictures?
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1 replies | 87 view(s)
09-11-2018,
02:34 PM
tkhunny
replied to a thread
Math word problem help: Sales in year x given by S(x) = 210x + 500
in
Beginning Algebra
There is enough information. 1982 ==> 1982 - 1982 = 0 ==> S(0) = 210(0) + 500 = 000 + 500 = 500 = 1982 sales. 1983 ==> 1983 - 1982 = 1 ==> S(1) =...
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2 replies | 93 view(s)
09-11-2018,
02:24 PM
tkhunny
replied to a thread
How Do I Solve This? (d^2 z)/(dx dy) = -(x ln(x))^{-1}, w/ x=y=z, ...
in
Calculus
What is \dfrac{d}{dx}x^{x}? Otherwise, I suppose I could be a fun problem to work out with the definition of a derivative. :-)
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1 replies | 78 view(s)
09-10-2018,
06:20 PM
tkhunny
replied to a thread
I need help about a poly descomposition: [(x^2-x-21)/(2x^3-x^2+8x-4)]
in
Beginning Algebra
Various ways exist to go about it. What do you know of the Rational Root Theorem? Is your Synthetic Division all practiced up?
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2 replies | 90 view(s)
09-10-2018,
06:18 PM
tkhunny
replied to a thread
Finite Hw Problem: 5 pencils, 4 ball point pens, and 2 felt-tip pens.
in
Probability / Statistics
Have you considered a different problem? "no more than one" = "not both" Don't always just stick with the given language. Recast the problem...
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1 replies | 79 view(s)
09-06-2018,
07:09 AM
tkhunny
replied to a thread
Something that should be straightforward: difference of 6, product of 3127
in
Arithmetic
Please do not delete. Excellent example. Sometimes, it just helps to talk it out. Good work. What you did was recast the problem, from one of...
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5 replies | 255 view(s)
09-06-2018,
07:04 AM
tkhunny
replied to a thread
Blackjack betting 'Strategy'
in
Probability / Statistics
Absolutely agreed. There ARE strategies, just not of the variety suggested. :-)
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3 replies | 104 view(s)
09-05-2018,
09:29 PM
tkhunny
replied to a thread
Jenny's tokens: How meany seconds would it take to get 5,00 tokens?
in
Beginning Algebra
Come on. Give it a go. Surely you can count it up. Hint: 5000\;tokens * \dfrac{30\;seconds}{2\;tokens}
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2 replies | 165 view(s)
09-05-2018,
09:26 PM
tkhunny
replied to a thread
Blackjack betting 'Strategy'
in
Probability / Statistics
If you reload the cards and reshuffle after each hand, the process has no memory and there is no such thing as an advantageous betting strategy based...
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3 replies | 104 view(s)
09-05-2018,
09:20 PM
tkhunny
replied to a thread
Need to calculate 10 weekends every year.
in
Finance/Business Math
How are you getting the Day Names in there? Can't you just count the Saturdays?
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1 replies | 138 view(s)
09-04-2018,
12:50 PM
tkhunny
replied to a thread
Algebra: Find all integer values of x, such that sqrt(x^2+x+1) is rational
in
Intermediate/Advanced Algebra
Great. Let's see some of that algebra. If\;\sqrt{x^{2} + x + 1}\;is\;rational,\;what\;does\;that\;say\;of\;x^{2} + x+...
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7 replies | 218 view(s)
09-03-2018,
12:16 PM
tkhunny
replied to a thread
Optimization with 2 variables in the objective function and 3 variables in constraint
in
Calculus
Not making a ton of sense. Why is "Consumption" part of income? What does "Y(I)" mean? Is that multiplication or function notation? If "I"...
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9 replies | 196 view(s)
09-01-2018,
06:46 PM
tkhunny
replied to a thread
2 die roll vs 1 die roll + 7: Player A rolls a 6 sided die twice...
in
Probability / Statistics
Seems as though some have assumed that B > A means B WINS. I don't see it in the problem statement.
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8 replies | 285 view(s)
09-01-2018,
01:30 PM
tkhunny
replied to a thread
2 die roll vs 1 die roll + 7: Player A rolls a 6 sided die twice...
in
Probability / Statistics
You can just build a table. Player A rolls a 2, Player B can roll anything. Player A rolls a 3, or 4, or 5, or 7, Player B can roll anything....
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8 replies | 285 view(s)
08-30-2018,
09:41 AM
tkhunny
replied to a thread
Combinations: A woman has 11 close friends, and wants to invite some for dinner.
in
Geometry and Trig
#1 Decide if "order matters". Is "Steve and Margaret" a different invitation from "Margaret and Steve"? #2 b1 is a favorite. Just tape them...
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3 replies | 152 view(s)
08-29-2018,
03:03 PM
tkhunny
replied to a thread
tangent to a circle: How do I draw this from the textual description?
in
Geometry and Trig
Any way you can and in such a way that all the requirements are met.
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3 replies | 167 view(s)
08-28-2018,
03:24 PM
tkhunny
replied to a thread
Author says: Chance of Horse B finishing in the top three is about 74%. (How??)
in
Probability / Statistics
#1 - Odds in Horse Racing are NOT the Probability of Winning. The odds are a reflection of peoples' opinions of their chances of winning and a...
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1 replies | 78 view(s)
08-28-2018,
03:10 PM
tkhunny
replied to a thread
Joint distr of (X,Y) is f(x,y)=c(x^2+y^2) for 0<=x,y<=1 (0 otherwise); find c, ...
in
Probability / Statistics
a) There is a small integral in your future. What is it? b) What is the definition of independence? Try it out. c) Substitution? Could it be...
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1 replies | 58 view(s)
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About tkhunny
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"Unique Answers Don't Care How You Find Them." - Many may have said it, but I hear it most from me.
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